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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3646) Providing bzip2 as codec
Date Fri, 18 Jul 2008 11:52:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12614702#action_12614702

Hadoop QA commented on HADOOP-3646:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 677839.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 1 new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2900/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2900/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2900/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2900/console

This message is automatically generated.

> Providing bzip2 as codec
> ------------------------
>                 Key: HADOOP-3646
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3646
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: conf, io
>    Affects Versions: 0.19.0
>            Reporter: Abdul Qadeer
>            Assignee: Abdul Qadeer
>             Fix For: 0.19.0
>         Attachments: HADOOP-3646-version4.patch, HADOOP-3646.patch, HADOOP-3646.patch,
>   Original Estimate: 1008h
>  Remaining Estimate: 1008h
> Hadoop recognizes gzip compressed input and automatically decompresses the data before
providing it to the mapper. But Hadoop can not split a gzip stream due to the very nature
of the gzip compression. Consequently one gzip stream (e.g a whole file) can go to only one
mapper.  On the contrary Bzip2 compressed stream can be split across its block delimiters.
> We are interested in extending Hadoop to support splittable bzip2 with a codec.  (https://issues.apache.org/jira/browse/HADOOP-1823
 uses input reader to split the bzip2 files, which must be provided by the user and can handle
FileInputFormat.  If a user wants to use some other input format or wants to do custom record
handling, he must write a new input reader!)
> We have a patch now that provides a basic bzip2 codec equivalent to the current gzip
codec.  We are in the process of extending that to support splitting.

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